你好,我创建了一个函数,它以接受的sockFD作为输入,并将IP地址以演示形式输出到字符串。该函数似乎正常工作,直到我使用inet_ntop调用打包字符串,返回空指针并给出错误。错误显示为设备上没有剩余空间,这一点我不理解,因为我有足够的RAM和ROM。无论如何,以下是我正在使用的函数。
void getTheirIp(int s, char *ipstr){ // int s is the incoming socketFD, ipstr points the the calling
// functions pointer.
socklen_t len;
struct sockaddr_storage addr;
len = sizeof(addr); //I want to store my address in addr which is sockaddr_storage type
int stat;
stat = getpeername(s, (struct sockaddr*)&addr, &len); // This stores addrinfo in addr
printf("getTheirIP:the value of getpeername %d\n",stat);
// deal with both IPv4 and IPv6:
if ((stat=addr.ss_family) == AF_INET) { // I get the size of the sock first
printf("getTheirIP:the value of addr.ss_family is %d\n",stat);
ipstr = malloc(INET_ADDRSTRLEN); // I allocate memory to store the string
struct sockaddr_in *s = (struct sockaddr_in *)&addr; // I then create the struct sockaddr_in which
// is large enough to hold my address
if(NULL == inet_ntop(AF_INET, &s->sin_addr, ipstr, sizeof(ipstr))){ // I then use inet_ntop to
printf("getTheirIP:the value of inet_ntop is null\n");// retrieve the ip address and store
perror("The problem was"); // at location ipstr
}
} else { // AF_INET6 this is the same as the above except it deals with IPv6 length
ipstr = malloc(INET6_ADDRSTRLEN);
struct sockaddr_in6 *s = (struct sockaddr_in6 *)&addr;
inet_ntop(AF_INET6, &s->sin6_addr, ipstr, sizeof(ipstr));
}
printf("%s",ipstr);
}
我省略了程序的其余部分,因为它太大而无法适应,我只想集中精力解决这一部分问题。然而,在下面,我将向您展示调用此函数的main()的一部分。
newSock = accept(listenSock,(struct sockaddr *)&their_addr,&addr_size);
char *someString;
getTheirIp(newSock,someString);
任何帮助都将是极好的。谢谢!